Schedule of Segment Reporting Information, by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 1,049,201	$ 926,458	$ 2,666,413	$ 2,196,428
Income (Loss) Before Income Taxes	62,625	61,219	135,767	117,363
Recreation Vehicles
Segment Reporting Information [Line Items]
Net Sales	929,765	807,196	2,327,794	1,869,850
Income (Loss) Before Income Taxes	77,622	59,162	159,738	115,970
Buses
Segment Reporting Information [Line Items]
Net Sales	119,436	119,262	338,619	326,578
Income (Loss) Before Income Taxes	(7,690)	2,828	(2,678)	10,693
Corporate
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	(7,307)	(771)	(21,293)	(9,300)
Towables | Recreation Vehicles
Segment Reporting Information [Line Items]
Net Sales	742,429	680,472	1,904,449	1,623,782
Income (Loss) Before Income Taxes	62,540	51,050	129,335	104,810
Motorized | Recreation Vehicles
Segment Reporting Information [Line Items]
Net Sales	187,336	126,724	423,345	246,068
Income (Loss) Before Income Taxes	$ 15,082	$ 8,112	$ 30,403	$ 11,160